/********************************** (C) COPYRIGHT  *******************************
 * File Name          : ch32v30x_exti.c
 * Author             : WCH
 * Version            : V1.0.0
 * Date               : 2021/06/06
 * Description        : This file provides all the EXTI firmware functions.
 * Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
 * SPDX-License-Identifier: Apache-2.0
 ***************************************************************************************/
#include "ch32v30x_exti.h"

/* No interrupt selected */
#define EXTI_LINENONE    ((uint32_t)0x00000)

/*********************************************************************
 * @fn      EXTI_DeInit
 *
 * @brief   Deinitializes the EXTI peripheral registers to their default
 *        reset values.
 *
 * @return  none.
 */
void EXTI_DeInit(void)
{
	EXTI->INTENR = 0x00000000;
	EXTI->EVENR = 0x00000000;
	EXTI->RTENR = 0x00000000;
	EXTI->FTENR = 0x00000000;
	EXTI->INTFR = 0x000FFFFF;
}

/*********************************************************************
 * @fn      EXTI_Init
 *
 * @brief   Initializes the EXTI peripheral according to the specified
 *        parameters in the EXTI_InitStruct.
 *
 * @param   EXTI_InitStruct - pointer to a EXTI_InitTypeDef structure
 *
 * @return  none.
 */
void EXTI_Init(EXTI_InitTypeDef *EXTI_InitStruct)
{
	uint32_t tmp = 0;

	tmp = (uint32_t) EXTI_BASE;
	if (EXTI_InitStruct->EXTI_LineCmd != DISABLE)
	{
		EXTI->INTENR &= ~EXTI_InitStruct->EXTI_Line;
		EXTI->EVENR &= ~EXTI_InitStruct->EXTI_Line;
		tmp += EXTI_InitStruct->EXTI_Mode;
		*(__IO uint32_t *) tmp |= EXTI_InitStruct->EXTI_Line;
		EXTI->RTENR &= ~EXTI_InitStruct->EXTI_Line;
		EXTI->FTENR &= ~EXTI_InitStruct->EXTI_Line;
		if (EXTI_InitStruct->EXTI_Trigger == EXTI_Trigger_Rising_Falling)
		{
			EXTI->RTENR |= EXTI_InitStruct->EXTI_Line;
			EXTI->FTENR |= EXTI_InitStruct->EXTI_Line;
		}
		else
		{
			tmp = (uint32_t) EXTI_BASE;
			tmp += EXTI_InitStruct->EXTI_Trigger;
			*(__IO uint32_t *) tmp |= EXTI_InitStruct->EXTI_Line;
		}
	}
	else
	{
		tmp += EXTI_InitStruct->EXTI_Mode;
		*(__IO uint32_t *) tmp &= ~EXTI_InitStruct->EXTI_Line;
	}
}

/*********************************************************************
 * @fn      EXTI_StructInit
 *
 * @brief   Fills each EXTI_InitStruct member with its reset value.
 *
 * @param   EXTI_InitStruct - pointer to a EXTI_InitTypeDef structure
 *
 * @return  none.
 */
void EXTI_StructInit(EXTI_InitTypeDef *EXTI_InitStruct)
{
	EXTI_InitStruct->EXTI_Line = EXTI_LINENONE;
	EXTI_InitStruct->EXTI_Mode = EXTI_Mode_Interrupt;
	EXTI_InitStruct->EXTI_Trigger = EXTI_Trigger_Falling;
	EXTI_InitStruct->EXTI_LineCmd = DISABLE;
}

/*********************************************************************
 * @fn      EXTI_GenerateSWInterrupt
 *
 * @brief   Generates a Software interrupt.
 *
 * @param   EXTI_Line - specifies the EXTI lines to be enabled or disabled.
 *
 * @return  none.
 */
void EXTI_GenerateSWInterrupt(uint32_t EXTI_Line)
{
	EXTI->SWIEVR |= EXTI_Line;
}

/*********************************************************************
 * @fn      EXTI_GetFlagStatus
 *
 * @brief   Checks whether the specified EXTI line flag is set or not.
 *
 * @param   EXTI_Line - specifies the EXTI lines to be enabled or disabled.
 *
 * @return  The new state of EXTI_Line (SET or RESET).
 */
FlagStatus EXTI_GetFlagStatus(uint32_t EXTI_Line)
{
	FlagStatus bitstatus = RESET;
	if ((EXTI->INTFR & EXTI_Line) != (uint32_t) RESET)
	{
		bitstatus = SET;
	}
	else
	{
		bitstatus = RESET;
	}
	return bitstatus;
}

/*********************************************************************
 * @fn      EXTI_ClearFlag
 *
 * @brief   Clears the EXTI's line pending flags.
 *
 * @param   EXTI_Line - specifies the EXTI lines to be enabled or disabled.
 *
 * @return  None
 */
void EXTI_ClearFlag(uint32_t EXTI_Line)
{
	EXTI->INTFR = EXTI_Line;
}

/*********************************************************************
 * @fn      EXTI_GetITStatus
 *
 * @brief   Checks whether the specified EXTI line is asserted or not.
 *
 * @param   EXTI_Line - specifies the EXTI lines to be enabled or disabled.
 *
 * @return  The new state of EXTI_Line (SET or RESET).
 */
ITStatus EXTI_GetITStatus(uint32_t EXTI_Line)
{
	ITStatus bitstatus = RESET;
	uint32_t enablestatus = 0;

	enablestatus = EXTI->INTENR & EXTI_Line;
	if (((EXTI->INTFR & EXTI_Line) != (uint32_t) RESET)
			&& (enablestatus != (uint32_t) RESET))
	{
		bitstatus = SET;
	}
	else
	{
		bitstatus = RESET;
	}
	return bitstatus;
}

/*********************************************************************
 * @fn      EXTI_ClearITPendingBit
 *
 * @brief   Clears the EXTI's line pending bits.
 *
 * @param   EXTI_Line - specifies the EXTI lines to be enabled or disabled.
 *
 * @return  none
 */
void EXTI_ClearITPendingBit(uint32_t EXTI_Line)
{
	EXTI->INTFR = EXTI_Line;
}
